Update firmware for Ultimaker printers (proper compiler)
UMO firmware was updated to Ultimaker/Marlin commit a2a5ba2042a3c38b62501d541b204e29775a2789.
UMO with heated bed firmware was updated to Ultimaker/Marlin commit dc0092e1410ef105091df2807c426ef0fe6781ee.
UMO+ firmware was updated to Ultimaker/Marlin commit af88a3bb2e812ce4bd9f004ef5d172cca597021d.
UM2 firmware was updated to Ultimaker/Ultimaker2Marlin commit 12b4cb9fad232411dd2b1cafe821547ee5f1e272.
UM2ex firmware was updated to Ultimaker/Ultimaker2Marlin commit 75f889933c912bf150855b40d5da965c92b30183.
UM2go firmware was updated to Ultimaker/Ultimaker2Marlin commit ce3f095a3f04c9c46abeb4fd263d02580248507a.
UM2+ firmware was updated to Ultimaker/UM2.1-Firmware commit a50078d83710739771dbe5fc3d4ee8da6ada30c5.
UM2ex+ firmware was updated to Ultimaker/UM2.1-Firmware commit 21df8ed57771523809c3801ca76cb4c9b9003a20.
These are all the latest versions as of today, 2016-2-18. They were built with avr-gcc 4.8.3 which fixes the printers not being able to read their SD cards any more.